. >> and president obama helped celebrate a key moment in our nation's history. his speech that echoed martin luther king junior's speech. >>> things are going to warm up. how warm will it be in your city tomorrow? i'll have the details. . >>> they came by the thousands from every corner of our country, men and women, young and old, blacks who long for freedom, and whites what can no longer accept freedom for themselves while witnessing the segregation of others. >> president obama on the mall today pay be tribute to dr. martin luther king junior and all those who marched 50 years ago. thousands participated in today's celebration, and it not only noted the progress but the ground that yet needs to be traveled. >> bells rang out at the exact hour martin luther king's dream sang out. >> president obama, the nation's first black president, standing exactly where dr. king stood reflecting on the progress and the work that remains. >> no one can match king's brilliant, but the same flame that lit the heart of all who are willing to take the first step for justice. i